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          CSS进阶知识点--Transform坐标系统与CSS矩阵及扩展
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        <h1 id="Transform-与坐标系统"><a href="#Transform-与坐标系统" class="headerlink" title="Transform 与坐标系统"></a>Transform 与坐标系统</h1><h2 id="transform-origin-属性"><a href="#transform-origin-属性" class="headerlink" title="transform-origin 属性"></a>transform-origin 属性</h2><p>允许你更改转换元素的位置</p>
<h3 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h3><blockquote>
<p>transform-origin: x-axis y-axis z-axis</p>
</blockquote>
<h1 id="CSS3-矩阵"><a href="#CSS3-矩阵" class="headerlink" title="CSS3 矩阵"></a>CSS3 矩阵</h1><p>CSS3 中的矩阵指的是一个方法，书写为 matrix() 和 matrix3d()。</p>
<p>matrix 是元素 2D 平面的移动转换（transform），2D 变换矩阵为 3*3。</p>
<p>matrix3d 是元素 3D 的移动变换（transform），3D 变换则是 4*4 的矩阵</p>
<h2 id="矩阵-matrix"><a href="#矩阵-matrix" class="headerlink" title="矩阵 matrix"></a>矩阵 matrix</h2><blockquote>
<p>transform: matrix(a, b, c, d, tx, ty)</p>
</blockquote>
<p>注意书写方向是竖直方向</p>
<h2 id="转换公式"><a href="#转换公式" class="headerlink" title="转换公式"></a>转换公式</h2><p>x，y表示转换元素的所有坐标</p>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-0e75d52a982dff3e.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="image"></p>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-ca05339467c90dc4.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="image"></p>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-3adbce44856aa3af.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="image"></p>
<h3 id="镜像对称公式"><a href="#镜像对称公式" class="headerlink" title="镜像对称公式"></a>镜像对称公式</h3><p><code>matrix((1-k*k) / (1+k*k), 2k / (1 + k*k), 2k / (1 + k*k), (k*k - 1) / (1+k*k), 0, 0)</code></p>
<p>k 代表所要对称的斜率</p>
<h1 id="CSS3-扩展属性"><a href="#CSS3-扩展属性" class="headerlink" title="CSS3 扩展属性"></a>CSS3 扩展属性</h1><h2 id="transform-style-属性"><a href="#transform-style-属性" class="headerlink" title="transform-style 属性"></a>transform-style 属性</h2><p>指定嵌套元素是怎样在三维空间中呈现</p>
<blockquote>
<p>transform-style：flat(默认值) | preserve-3d</p>
</blockquote>
<h2 id="backface-visibility-属性"><a href="#backface-visibility-属性" class="headerlink" title="backface-visibility 属性"></a>backface-visibility 属性</h2><p>指定元素背面面向用户时是否可见</p>
<h3 id="语法-1"><a href="#语法-1" class="headerlink" title="语法"></a>语法</h3><blockquote>
<p>backface-visibility: visible( 默认值 ) | hidden</p>
</blockquote>

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